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Our instincts draw from pretty far back in our biological origins as well. The notion of mimiclike predators is pretty damned ancient and likely a factor for very earliest common ancestry.
Mimiclike predators sound like psychopaths. Which, very much would be a reason we evolved uncanny valley, but they learned to blend in.
Psychopath isn't a real mental disorder, it's just Latin for mentally ill person.
Psychopath is derived from Ancient Greek... And even besides that, laymen generally use the term to describe ASPD despite the two conditions not being entirely the same. Don't be obtuse.
Yes, I'm aware that the word has been used as a slur against people with ASPD and other mental illnesses, what's your point?
There's also the concept of gender blindness until it became necessary to differentiate between groups and eventually people.
Sorta like the story of the color blue.